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Unlted States Patent [19] [11] Patent Number: 5,467,469 Saito et al.

[45] Date of Patent: Nov. 14,

1995 [54] CONIPUTER UNIT WITH A RESUME 4,767,341 8/1988 Lund 439/60 FUNCTION 4,812,677 3/1989 4,847,603 7/1989 [75] Inventors: Toshimitsu Saito;

Masahiko 4,907,150 3/1990 Kasashima;

Toshikazu Konno, all of

1008346 4/1991 5,012,406 4/1991 5,021,983 6/1991

7 1 [73] Assignee: Kabushiki Kaisha Toshiba, Kawasaki, 5'

218'

6'

) 6'

993 Japan FOREIGN PATENT DOCUMENTS Tokyo, Japan

0230351 '

7/1987 European Pat. 0a.. [21] APP1-N9-I173,877

0061832 5/1980 Japan 371/12 , _ 62―201861 12/1987 Japan. [22] Flled- Dec-27,1993 63-175228 11/1988 Japan. Related U.S. Application Data OTHER PUBLICATIONS . . IBM Technical Disclosure Bulletin, vol. 15, No. 1, Jun. [63] dcggletgfuanon of Ser'

No 572'

246'

Aug'

27'

1990'

aban'

1972, pp. 33―33A, R. C. Mattern, Loose Connector Detec tion . [30] Foreign Application Priority Data I _ _ Przmary Exammer―R0bert W. Beausohel, Jr. Aug. 28, Japan U Assistant Examiner__Ly V Hua NOV-30,1939 [JP] Japan ----

1309144 Attorney, Agent, or Firm―Oblon, Spivak, McClelland, Mar. 20,

1990 [JP] Japan 2-68079 Maier &

Neustadt [51] Int. Cl.G06F 11/30;

G06F 12/16 [57] ABSTRACT [52] U.S. c1.395/182.12;

395/375;

395/750 [58] Field Of Search 371/12, 66;

395/575, Upon detecting Tammi of a display Section from a Com 395/375 puter unit'

s main body, dismounting a battery, removal of a memory board from the computer unit'

s main body or the [56] References Cited like, the CPU saves system data no matter whether or not the resume mode is on and turns

011 the main power supply. U-S- PATENT DOCUMENTS Subsequently when the power switch is turned on the CPU 4,234,920 11/1980 van Ness et a1.364/2734 checking if Said System data is Saved- The CPU restores Said 4'

458'

307 7/1984 McAnliS et a1_371/66 system data and restarts the data processing in case where 4,632,398 12/1986 Freeman et a1. 273/148 B the preservation of Said System data is detect?d 4,757,505 7/1988 Marrington et a1.371/66 4,763,333 8/1988 Byrd 371/66

35 Claims,

12 Drawing Sheets {_____T I i | x____ | I L l DETECTOR ]\4 POWER CONTROL \5 RCUIT [/6 a _ ― _ h l'

_'

_'

1 l

1 : RoM ― CPU _4 RAM ~95 I i | I / §

1 i0

8 NON_ l } VOLATILE

1 , MEMORY ] : 1|~ RAM

1 | L v___J EXTERNAL MEMORY \7 DEVICE US. Patent Nov. 14,

1995 Sheet

1 of

12 5,467,469 VOLAT I LE MEMORY NON DETECTOR \

4 POWER CONTROL \―

5 CIRCUIT CPU {IN RAM EXTERNAL MEMORY DEVICE I FIG. US. Patent Nov. 14,

1995 Sheet

2 of

12 5,467,469 POWER SOURCE UNIT CPU DISPLAY DEVI CE CONTROL C I RCU I T

33 MEMORY WITH A BACKUP BATTERY FIG.

2 US. Patent Nov.14,

1995 Sheet

3 of

12 5,467,469

43 45 X EXTENSION .. ._ MEMORY SYSTEM OISMOuNTI NG [,IA'

I A OETEOTOR EXTENSION i I B I% I'

I%RJNTINc ;

4Q 1NMI SIGNAL 4? NMI CONTROL '

7-H! '

SYSTEM BOOT BLOCK __JV____ CONTROL BLOCK SEWER sAvINc- i RESTORATION COMMAND'

4? v A, SYSTEM DATA ROwER PRESERVATION\46 SOuRcE uNIT FLAG SYSTEM OATA FIG.

3 US. Patent Nov. 14,

1995 2I EXTEN SION MEMORY D I SMOUNT I NG NMI SIGNAL ? YES

22 Sheet

4 0f

12 NO 5,467,469 SYSTEM DATA SAVING SYSTEM DATA PRESERVATION FLAG SETTING I POWER OFF COMMAND OUTPUT ~24

25 I I OTHER NM I PROCESSING GB FIG.

4 US. Patent Nov. 14,

1995 Sheet

5 0f

12 5,467,469 IS SYSTEM DATA SAVED '